Billie piper would be an amazing guest to have at lfcc or any UK con really this year! Its the 10 year anniversary of the start of her series, so it would be perfect, and as she hasn't done a UK convention since 2013 it would make a lot of fans happy who haven't been able to meet her.
Then john barrowman, Freema ageyman, Noel Clarke, David tennant, Matt smith and Jenna Coleman would be great guests, it seems most of the doctor who cast only do US conventions and others abroad now, so please showmasters! get some new series doctor who cast!:)